[Webkit-unassigned] [Bug 75528] Optimize the multiply-add in Biquad.cpp::process

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Wed Jan 4 18:04:48 PST 2012


--- Comment #2 from Chris Rogers <crogers at google.com>  2012-01-04 18:04:48 PST ---
Thanks for the optimization!  Any idea how much improvement this gives?

I'm adding Raymond as reviewer here, and think we should get at least a very simple Biquad layout test written to validate both the existing code, and your new code.  The layout test can do the following:

1. create a BiquadFilterNode, configure it as lowpass at a certain cutoff frequency
2. feed an impulse into the filter in an OfflineAudioContext
3. compare the result with the expected output using JavaScript to generate the expected response (we can borrow the math from Biquad.cpp and convert to JS.

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